What are the husband’s obligations towards his children and his ex-wife who has custody of them?

Question A man divorced his wife irrevocably, and he has a daughter and two sons from her. She will have custody of them, and he will arrange accommodation for them, by Allah’s leave, and pay maintenance for the children. This is after coming to an amicable agreement without referring the matter to the courts, and the amount agreed upon is double what the courts would order, based on what some lawyers told us. He has two questions: is he obliged to pay for the repair of any damage to appliances and the like in the accommodation he is providing, or should the cost of repairs and maintenance for these appliances be part of the agreed-upon maintenance? He also wants to know his financial duties towards his ex-wife, and whether he is obliged to provide accommodation for her? Is there something called “ ‘iddah maintenance” , as they have asked him for something called “ ‘iddah maintenance (nafaqat al-‘iddah)”, which is different from nafaqat al-mut‘ah and al-mu’akhkhar (delayed portio...